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Question

If [ .] denotes GIF, then solve for x:

(i) [x]=3

(ii) [2x1]=3

A
x(3,4]
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B
x[3,4)
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C
x[4,5)
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D
x[2,2.5)
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Solution

The correct option is D x[2,2.5)
(i) [x]=3
We know [x]x<[x]+1
3x<3+1
3x<4
x[3,4)

(ii) [2x1]=3
[2x1]2x1<[2x1]+1
32x1<3+1
42x<5
2x<52
x[2,2.5)

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